Sping MVC用@ResponseBody返回json入门实例

爱被打了一巴掌 2022-06-09 00:16 131阅读 0赞

大致思路：前台用ajax 上传表单参数------>到controller利用@ResponseBody转换成json数据------>前台接收

前台

test.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"  
        pageEncoding="utf-8"%>  
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">  
    <html>  
    <head>  
    <script type="text/javascript" src="static/js/jquery-3.2.1.slim.min.js"></script>  
    <script type="text/javascript" src="static/js/jquery.js"></script> 
    <script type="text/javascript" src="static/js/jquery.min.js"></script> 
    <meta http-equiv="Content-Type" content="text/html; charset=utf8">  
    <title>Insert title here</title>  
    <script type="text/javascript" language="javascript">
        function requestJson() {
            $.post("${pageContext.request.contextPath}/music/login1.do",
                    function(data) {
                        console.log(data)
                        alert("成功"+JSON.stringify(data))
                    }, "json");
            
        }
    </script> 
    </head>  
    <body>  
       <form id="jsonh">
            <input type="button" value="开始" οnclick="requestJson()" />
        </form>
    </body>  
    </html>

$\{pageContext.request.contextPath\}不懂的看这篇博客[http://blog.csdn.net/mint6/article/details/77381444][http_blog.csdn.net_mint6_article_details_77381444]

前台主要是  点击按钮     开始---->触发onclick点击requestJson()函数---->post方式，提交路径---->然后是一个回调函数

data接收从后台传来的数据

LoginController.java

package com.music.controller;
    
    import java.util.HashMap;
    import java.util.Map;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.ResponseBody;
    
    @Controller  
    @RequestMapping("/music")
    public class LoginController {
         
         @RequestMapping("/login1.do")  
         @ResponseBody
            public  Map<String,Object> login(){  
               
                Map<String,Object> map = new HashMap<String,Object>();  
                  map.put("a", "1");
                  for (String s : map.keySet()) {
                      System.out.println("key:" + s);
                      System.out.println("values:" + map.get(s));
                      }
                return map;  
            }  
    
    }

前台根据路径进入login函数--->这里为了演示自己写了一个map并put保存数据--->然后@ResponseBody转换格式---->然后返回前台，回调函数接收

如果出现406错误 看这个[http://blog.csdn.net/mint6/article/details/77464724][http_blog.csdn.net_mint6_article_details_77464724]

[http_blog.csdn.net_mint6_article_details_77381444]: http://blog.csdn.net/mint6/article/details/77381444
[http_blog.csdn.net_mint6_article_details_77464724]: http://blog.csdn.net/mint6/article/details/77464724